It sounds like you are getting "thread nesting" or what I call "thread barfs."

Remove the top thread from the machine.ALWAYS RAISE the presser foot and rethread from the beginning.Check that the thread path is correct.Set the top tension to the midway point (and, if needed, tweak this because every machine is slightly different and subject to wear).

If you continue to have problems, you should probably take it back where it was serviced and have them look at it again.

P.S.--try installing a brand new needle and see if that helps. And, try a different brand of thread--AVOID old or bargain bin thread!

This will help with tension issues:http://www.threadsmagazine.com/item/4302/understanding-thread-tension/page/all

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Always be sure you are using the correct bobbin for your machine. Class 66, Class 15 and Class 15J bobbins look very similar. However, using the incorrect bobbin class in your machine can cause damage.

try changing the needle
when sewing a project-- the needle & fabric & thread must be compatablecheck to see if there is any burrs on the needle plate or on the bobbin casealways make sure every thread guide is usedmake sure the bobbin is inserted correctly in the bobbin case

My Husqvarna started having problems with the bobbin. The thread from the bobbin side is a tangled mess when I stitch. The top looks fine, but the seam falls apart easily and the backside is all tangled. I cleaned underneath the bobbin holder but it didn't help.

It happened to me... Check the bobbin and thread in the shaft ... Pull out the bobbin and remove all thread from the shaft. Pull out any thread remains with the tweezers. Check the feeder dogs and the needle (see Owner's Manual 2:7). Re-insert the bobbin (see Owner's Manual 2:12).Make sure that you use a good quality thread and set everything up correctly. Good luck!

First, open the needle plate and make sure the bobbin area is clean and free of lint and thread.

Check the needle to make sure it is not bent and is properly inserted into the holder - usually with the flat side facing to the back of the machine.

Refer to your manual for bobbin insertion to be sure the thread is feeding from the bobbin in the correct direction and through the proper guides.

Always thread a sewing machine with the presser foot up. This opens the tension control and allows the thread to properly enter.

When the foot is down, the tension control closes to the sewing setting and if the thread is not in place, there is no tension on the thread and it gets loopy.

After threading, lower and raise the needle while holding onto the thread tail. This will pull the bobbin thread up through the needle plate. Take hold of both threads and take them under the presser foot and to the back of the machine.

Hand walk the first stitch when sewing and this should keep the top and bottom thread from tangling.

When stopping to change the position of the fabric (turning a corner, sewing a curved seam for example), do so with the needle down into the fabric. This not only anchors the fabric so it does not slip, but prevents mis-stitching.

If you are doing everything according to the manual and are still having a problem, the machine may need to be professionally serviced.

when the needle pulls the fabric into the feed dog you dont have enough fabric behund the neelde when you srart, and the fabric gets caught in the feed and the bobbin case underneath clean it out anf change the needle they often get bent after they get tangled in the thread and fabric